NOVA"Great Cathedral Mystery"
The engineering behind the dome that crowns Florence's cathedral of Santa Maria del Fione, a Renaissance masterpiece and the world's largest masonry dome, is still debated among historians and engineers. Now a team of U.S. bricklayers helps build an experimental "mini-Duomo" using period tools and techniques to try to unravel how architect Filippo Brunelleschi managed it.G

6:00 pm

Super Skyscrapers"Building The Future"
Commonly known as "the cheese grater," the Leadenhall Building is the pinnacle of London's avant-garde architecture. The tapered tower with a steel exoskeleton is the tallest skyscraper in the City of London, and the teams behind the project had to radically rethink every aspect of the traditional building model. Part 2 of 4G

7:00 pm

America Revealed"Nation on the Move"
Yul Kwon journeys across the continent by air, road and rail and ventures behind the scenes with the workers who get people and goods where they need to go in a nation whose population is the most mobile on Earth. He visits the Federal Aviation Administration command center, meets innovators creating ways to propel people farther and faster, and sees how transportation analysts keep traffic at bay in Las Vegas by revolutionizing the traffic light. Part 2 of 4G

Nightly Business Report
Tonight on Nightly Business Report, A mega media deal. Comcast to buy Time Warner Cable combining the nation's two largest cable providers. Why? What does it mean for consumers? And what will the regulators say? And shoppers stayed home last month causing retail sales to drop. D

Super Skyscrapers"Building The Future"
Commonly known as "the cheese grater," the Leadenhall Building is the pinnacle of London's avant-garde architecture. The tapered tower with a steel exoskeleton is the tallest skyscraper in the City of London, and the teams behind the project had to radically rethink every aspect of the traditional building model. Part 2 of 4G